Stop motion for jacquard looms



Nov. 12, 1957 c. w. HOLT STOP MOTION FOR JACQUARD LOOMS 4 Sheets-Sheet 1 Filed April 14, 1955 CHARLIE W. Ham} INVENTOR ATTORNEYS":

Nov. 12, 1957 c. w. HOLT 2,812,781

STOP MOTION FOR JACQUARD LOOMS Filed April 14, 1955 4 Sheets-Sheet 2 CHARLIE W. HOLT.

INVENTORI ATTORNEYS 12, 1957 c. w. HOLT 2,812,781

STOP MOTION FOR JACQUARD LOOMS Filed April 14, 1955 1 4 Sheets-Sheet 5 INVENTOR; 35 CHARLIE W. HOLT.

- ATTORNEYS.;

1957' c. w. HOLT I 2,812,781

STOP MOTION FOR JACQUARD LOOMS Filed April 14, 1955 4 Sheets-Sheet 4 95 I I 2104 I CHARLIE W. Hon.

' INVENTOR;

BY mwwai. I

ATTORNEYS.

United States Patent STOP MOTION FOR JACQUARD LOOMS Charlie W. Holt, Draper, N. C.

Application April 14, 1955, Serial No. 501,237

6 Claims. (Cl. 139-338) This invention relates to jacquard looms and, more especially, to improved means for actuating the conventional stop motion of a loom in the event of failure of the pattern cards of a jacquard mechanism to properly perform their intended function.

It is an object of this invention to provide a simple and effective means for actuating a conventional electrically operable stop motion of a jacquard loom in the event of the pattern cards in a jacquard mechanism becoming disarranged.

It is another object of this invention to provide an improved stop motion for a double cylinder, double lift jacquard loom, or any other type of jacquard loom, in which means are provided for automatically actuating the stop motion of the loom in the event the passage of the pattern cards over the cylinder becomes improperly timed relative to other operating parts of the loom or in the event of a cylinder becoming improperly alined with the needles of the jacquard mechanism or in the event of the cards becoming improperly alined with a corresponding cylinder or becoming wrapped around the cylinder.

Some of the objects of the invention having been stated, other objects will appear as the description pro ceeds when taken in connection with the accompanying drawings, in which- Figure 1 is a front elevation of a jacquard loom pro vided with a double lift, double cylinder jacquard mechanism thereon and showing parts of the improved apparatus in association therewith;

Figure 2 is a fragmentary isometric view showing a jacquard cylinder with a contact strip or bus bar on one side thereof and showing the relationship between a card on the jacquard cylinder and a special needle for closing a switch upon active cards becoming improperly alined with the needle;

Figure 3 is an enlarged fragmentary elevation, partially in section, taken substantially along line 3-3 in Figure 1;

Figure 4 is a fragmentary elevation, partially in section, looking at the right-hand side of Figure 3;

Figure 5 is an enlarged vertical sectional view taken substantially along line 5-5 in Figure 4;

Figure 6 is a fragmentary view showing, somewhat schematically a conventional electrical stop motion of a loom;

Figure 7 is a somewhat schematic longitudinal vertical sectional view through the upper portion of the jacquard mechanism shown in the upper portion of Figure 1;

Figure 8 is a top plan view of the structure shown in Figure 7 looking down substantially along line 8-8;

Figure 9 is a view similar to Figure 8 but being taken on a lower level substantially along the line 9-9 in Figure 7;

Figure 10 is a diagrammatic view of a preferred electrical circuit for the apparatus.

, wood or non-metallic construction and are provided with Referring more specifically to the drawings, the numerals 1t) and 11 indicate side frame members of a loom which side frame members support the usual weaving instrumentalities including a lay 12 (Figure l) which is driven in the usual manner by a constantly rotating crank shaft 13 (Figure 3). As is well known, the crank shaft 13 rotates a complete revolution with each pick and the loom is provided with a conventional cam shaft 14 which rotates one-haif revolution with each pick. The cam shaft 14 drives a conventional jacquard mechanism broadly designated at 20, which jacquard mechanism is shown in the form of a double lift, double cylinder jacquard mechanism in this instance. However, the improved stop motion actuating apparatus may be used with a single cylinder jacquard mechanism without departing from the spirit of the invention.

Since the connections between the cam shaft 14 and the jacquard mechanism 20 are conventional and are of well known construction, a description thereof is deemed unnecessary and only so much of the jacquard mechanism will be described as is necessary to a clear understanding of the present invention.

The frame of the jacquard mechanism 20, including spaced from and rear frame members 2%, 20b, is supported on a suitable framework including horizontal beams 21 spaced above the loom and opposite ends of which are supported on upright posts 22. The jacquard mechanism 20 is provided with a pair of square or rectangular cylinders 24, 25 which are moved inwardly and outwardly in alternation and over which pass respective series of cards 26, 27 (Figures 7, 8 and 9). As usual, the cards 26 control a first or upper bank of needles 3t) and the cards 27 control a lower or second bank of needles 31 (Figures 8 and 9). The needles, in turn, control two series of hooks which cooperate with griff bars in a well known manner such as described in the patent to Helderman, No. 1,326,262, dated December 30, 1919. Accordingly, a detailed illustration and description of the hooks and griff bars is deemed unnecessary.

The cylinders 24, 25 are alternately rotated in a stepby-step manner as they alternately move outwardly away from the frame of the jacquard mechanism 20 in a conventional manner. To this end, it will be observed in Figures 1, 8 and 9 that opposite ends of the cylinders 24, 25 are provided with respective pairs of journal portions 32, 33 which are journaled in respective pairs of bearings 34, 35 guided on the frame of the jacquard mechanism 24) for horizontal movement and which are caused to move outwardly and inwardly in alternation in a conventional manner in timed relation to oscillation of the lay as imparted thereto by rotation of the crank shaft 13.

It will be observed in Figures 2, 8 and 9 that each end of the card cylinder 24 has a reduced square or rectangular portion 36 thereon, on each corner of which a projection 37 is provided. Each end of the cylinder 25 is also provided with a reduced rectangular or square portion 36 thereon, on each corner of which an elongated projection 37' is provided. In the course of outward strokes of the cylinders 24, 25 dogs or hook portions 40, 40 (Figures 1 and 7) on respective ratchet pawls 41, 4-1 engage one of the projections 37, 37' on the corresponding cylinders 24, 25 to impart a quarter revolution in rotation thereto. The cylinders 24, 25 are of usual rectangular or square,

four sides respectively indicated at a to d, inclusive, and a to d, inclusive. Each of these sides is provided with a pair of longitudinally spaced buttons or projections 42 thereonwhich are adapted to fit in corresponding holes 43 provided in each of the cards 26, 27.

As is well known to those familiar with the art, the pattern cards 26, 27 are variously perforated, as at 46, and when they are positioned for engaging the needles, the needles merely pass through the various perforations alined therewith and leave the corresponding hooks, not shown, in position to be raised by their corresponding griff bars, not shown. On the other hand, the imperforate areas in the pattern cards engage the needles alined therewith,

thrusting these needles longitudinally and thereby flexing the corresponding hooks laterally to clear their corresponding griif bars. The usual cords, generally designated at 47 (Figure 1) are connected in a conventional manner to the lower ends of the hooks, not shown, and these cords 47 extend through the usual comber board 50 and their lower ends are connected to conventional heddles, not

shown.

In addition to the front and rear frame members 26a and b, the frame of the jacquard mechanism 26 also include-s an upper pair of horizontal frame members 51, 52

and a lower pair of spaced horizontal frame members 51', 52. The first or upper bank of needles 36 are guided for horizontal movement in frame members 51, 52 and the lower or second bank of needles 31 are guided for horizontal movement in frame members 51, 52'.

There are various types of stop motions which may be actuated by the improved apparatus, to be later described, and a typical stop motion mechanism is shown in Figure 6 which includes a bracket 60 fixed to the loom side frame member 10 and which supports a solenoid broadly designated at 61, said solenoid including a solenoid coil 62 and a solenoid plunger 63. The solenoid coil 62 has conductors or wires 64, 65 connected to opposite ends thereof (Figures 6 and 10), the wire 64 being connected with the improved stop motion actuating means, to be later described, and the end of the wire 65 remote from coil 62 being connected to one end of a secondary winding of a transformer generally designated at T in Fig ure 10.

The other end of the secondary winding is grounded at 67 and the primary winding of the transformer T has a pair of wires or conductors 70, 71 leading therefrom to a suitable source of electrical energy, not shown. The upper end of the plunger 63 of solenoid 61 is connected to one end of a lever 73 pivoted intermediate its ends on the bracket 60 and the other end of lever 73 has a link 75 pivotally connected thereto. The link 75 extends downwardly and is pivotally connected to a medial portion of a dagger 76 pivoted on a conventional stop motion arm 77 carried by the loom.

Upon energization of the coil 62 of solenoid 61, it is apparent in Figure 6, that the dagger 76 is moved upward ly to be engaged by a hunter 80 carried by the lay 12 during the course of the next succeeding backward or inactive stroke of the lay. As is well known, engagement of the dagger 76 by the hunter 80 as it moves from left to right in Figure 6 will impart corresponding movement to the dagger 76 and arm 77 to stop the loom. The parts heretofore described are conventional and the usual parts of a jacquard loom and it is with such parts that the present invention is'particularly adapted to be associated.

The improved stop motion actuating apparatus functions to actuate the stop motion in the event of (1) any one of the pattern cards on'either of the cylinders 24, being improperly located longitudinally of the corresponding cylinder; (2) or any one of the cards on the face of either card cylinder being skewed with respect to the longitudinal axis of the corresponding cylinder; (3) or the pattern card's wrapping around either of the jacquard cylinders 24, 25 (4) or either of jacquard cylinders 24, 25 being disposed at an angle relative to the corresponding bank of needles, such as due to the bearings 34 or becoming worn; (5) or failure of either of the jacquard cylinders 24, 25 to be racked a quarter revolution in the interim between each active stroke thereof and (6) or either of the jacquard cylinders 24, 25 being racked in improper 4 f timed relationship to the weaving instrumentalities of the loom and, in particular, in improper relationship to rotation of the crank shaft 13 and cam shaft 14.

In order to cause actuation of the conventional stop motion; that is, in order to cause energization of the coil 62 of the solenoid 61, upon occurrence of any of the aforementioned conditions, the upper and lower banks of needles 30, 31 are provided with respective pairs of special needles 85, 86 and 86 which straddle the respective banks of needles 30, 31 as is most clearly shown in Figures 8 and 9. The special needles 85, 86 and 85', 86 are guided for horizontal movement in the respective frame members 51, 52 and 51', 52' in the same manner as the conventional needles 30, 31.

As is well known, each of the needles in the banks 30, 31 is urged toward the corresponding jacquard cylinder by conventional means and said conventional means is also employed to urge each of the needles 85, 86, 85', 86' toward the corresponding jacquard cylinder. To this end, it will be observed in Figure 2 that the frame member 52 is in the form of a channel bar and needle 85 has a collar or washer 90 fixed thereon which is urged into engagement with the'vertical or web portion of channel bar 52 by a compression spring 91 encircling the corresponding portion of needle 85. The outer end of compression spring 91 bears against a bar 92 whose upper and lower ends engage the outer edges of the flange portions of the channel bar 52 and which are maintained in proper vertical position by slotted members or bars 93, 94 fixed to the upper and lower flanges of the channel bar 52. The hooked outer end of each of the needles is guided in engagement with the corresponding bar 92 and it will be observed in Figure 10 that the hooked outer ends of the needles 85, 86, 85, 86' are alined with the plungers of respective normally open switches 95, 96, 95', 96'.

Each of the cards 26 is provided with a pair of longitudinally spaced perforations 100, 101 which, when the corresponding card 26 is properly alined with the bank of needles 30, are alined with the ends of the respective special needles 85, 86 remote from the respective switches 95, 96. Each of the cards 27 is also provided with a pair of special perforations 100, 101' corresponding to the perforations 100, 101 in each of the cards 26.

It will be noted that, when the perforations 166, 101, 100, 101 are properly alinedwith the respective special needles 85, 86, 85, 86, these needles merely pass through the corresponding perforations as the respective cylinders 24, 25 move inwardly. However, upon either one or both of the special perforations 100, 101 or 160, 101 in each of the cards 26 or 27 occupying operative position being improperly alined with the corresponding banks of needles 30, 31 for any of the reasons heretofore set forth, it is apparent that the free ends of the corresponding special needles will be engaged by imperforate portions of the cards and, as the cards move inwardly, any of the special needles whose ends are engaged by an imperforate portion of a corresponding card will be moved with the card to thereby close the corresponding switch 95, 96, 95 or 96'.

Upon any one or more of the switches 95, 96, 95, 96' being closed, this completes the circuit to the coil 62 of solenoid 61 to actuate the stop motion in the manner heretofore described. To this end, it will be observed in Figure 10 that the end of wire 64 remote from coil 62 is connected to a medial portion of a wire or conductor 105, opposite ends of which are connected to corresponding sides of the switches 96, 96'. Corresponding sides of switches 95, 95 also have wires or conductors 1 36, 166' leading therefrom to the wire 105. The other sides of the switches 95, 96, 95', 96 are each suitably grounded to the loom, as at 167. It will be observed in Figures 7 and 8 that each of the switches 95, 96, 95, 96 is supported on a bracket carried by the corresponding guide bar 94.

Now, in'case the step-by-step rotation of either of the cylinders 24, 25 becomes out of time relative to the cam shaft 14, it will be observed in Figure that the two sides d, b of cylinder 24 have respective lateral bus bars or switch-closing members 111, 112 thereon which are disposed to one side of the path of travel of the series of cards 26 and the opposed side surfaces, a, c of the cylinder also have respective transverse bus bars 111, 112 or switch-closing members fixed thereon which are also disposed out of the normal path of travel of the series of cards 27. The bus bars 111, 112 are adapted to alternately engage and establish contact between a pair of spaced leaf spring contact members or switch elements e, f with corresponding alternate active strokes of the jacquard cylinder 24. The bus bars 111', 112' are adapted to engage and establish contact between a pair of leaf spring contact members or switch elements e, f during alternate active strokes of the jacquard cylinder 25 in the periods intervening between active strokes of the cylinder 24. The bus bars 111, 112, 111, 112 cooperating with the respective sets of contacts e, f and e, f constitute switches.

The leaf spring contact members e, f are suitably insulatably secured to the outer surface of the frame member 51 of the jacquard mechanism 20 and the two leaf spring contact members e, f are suitably insulatably secured to the frame member 51 of the jacquard mechanism 21). The ends of wires 117, 117' lead from the respective contact members f to the wire 105. The ends of wires or conductors 115, 115 are connected to the respective contact members e, e and the other ends of the conductors 115, 115 are connected to respective incandescent lamps or electrically operated signal devices 116, 116. The signal devices or incandescent lamps 116, 116' are also connected to opposite ends of a conductor or wire 120, to a medial portion of which one end of a conductor or wire 121 is connected. The other end of thewire 121 is connected to a brush 122 which is a part of a rotary switch assembly broadly designated at 123. The brush 122 is disposed adjacent and extends parallel to -a brush 124 which is grounded to the loom, as at 125 (Figure i0).

Referring to Figures 3, 4 and 5, the brushes 122, 124 are fixed in respective insulationblocks 126, 127 pivotally mounted on a shaft 130. The shaft 130 is fixed to an arm 131 suitably secured to a bracket 132. In this instance, the bracket 132 has a longitudinally extending slot 133 therein which is penetrated by the reduced inner end portion of a stub shaft 134 which is adjustably secured in the slot 133 by a nut 135. The nut 135 also secures the corresponding end of the arm 131 to the inner surface of bracket 132. The lower end of bracket 132 is pivotally supported on the cam shaft 14 and the upper end thereof is secured on the reduced outer end of a rod or brace 136, as by a nut 137. The inner end of rod or brace 136 is suitably secured to the side member 10 of the loom.

The free ends of the brushes 122, 124 are resiliently urged toward a rotor, in the form of a flanged wheel 140 made from insulation material, by means of respective torsion springs 141, 142 which surround the shaft 130. The proximal ends of the torsion springs 141 142 are connected to the respective insulation blocks 126, 127 and the outer ends of the springs 141, 142 are fixed to collars 143, 144 fixed on the shaft 139. The rotor 140 is rotatably mounted on the shaft 134 and is fixed to the hub of a gear 146 which meshes with and is driven by a gear 147 fixed on the cam shaft 14. The gear 146 is loose on shaft 134 and is preferablylarger than gear 147 so it is rotated by the gear 147 a quarter revolution with each pick by the loom. The slot 133 inthe bracket 132 is provided so that the gears 146, 147 may be changed to different size gears to vary the number of revolutions of the gear 146 with each pick of the loom.

The periphery of rotor 140 has a segmental metallic contact 150 thereon which extends through an arc of substantially one hundred eighty degrees and which is of sufficient width so as to be engaged byiboth of the brushes 122, 124. As shown in Figure 10, the segmental contact 150 may be formed integral with a second segmental contact 150a which is of substantially lesser width than the contact 150 so only one of the brushes, such as brush 124, engages the 83.1116.

Now, assuming that the leaf spring contacts e, are in engagement with bus bar 112' on surface c of the jacquard cylinder 25, as shown in Figure 10, and that both of the cylinders 24, 25 are in the course of move ment from left to right, it is apparent that, during normal and proper operation of the jacquard cylinders 24, 25, the 1 brushes 122, 124 would then be in engagement with substantially the portion of the rotor and the corresponding portion of the narrow segmental contact a identified by the arrow A in the upper left-hand portion of Figure 5. As the cylinder 25 moves outwardly it is rotated a quarter revolution in a counterclockwise direction in Figure 10. As the surface c on cylinder 24 subsequently moves inwardly, a portion of the wide or broad segmental contact 150 indicated by the arrow B in the lower lefthand portion of Figure 5 will then be engaged by the contacts or brushes 122, 124.

With the next succeeding inward or active stroke of the cylinder 25, the surface 1; thereon then engages the leaf spring contacts e, f as substantially the portion of the segmental contact 15% indicated by the arrow C in the lower right-hand portion of Figure 5 registers with the contacts or brushes 122, 124. Of course, as the cylinder 24 moves outwardly from right to left it is rotated a quarter revolution in a clockwise direction in Figure 10 so that, with its succeeding active or inward stroke from left to right, the bus bar 111 on the surface 12 then engages and establishes contact between the leaf spring contact members e, At this time, the rotor 140 will have rotated to where substantially the portion thereof indicated by the arrow D in the upper "right-hand portion of Figure 5 will then engage the contacts or brushes 112, 124.

It'follows, therefore, that whenever the surfaces 0 or a of cylinder 25 occupy inward or active position, the portion of the rotor 140 identified by the reference character A will register with the brushes 122, 124; whenever the surfaces c or a are in inward or operative position,'the portion of the rotor ldil identified by the arrow to which the reference character B is applied will then register substantially with the brushes 122, 124; whenever the surfaces 12 or d occupy inward or active position, the portion of the rotor 140 identified by the arrow indicated by the reference charactcer C will be substantially in registration with the brushes 124, 125; and whenever the surfaces b or d occupy inward or active position, the portion of rotor Mi identified by arrow D will then be substantially in registration with the brushes 122, 124.

It is thus seen that, in normal operation, whenever either of the bus bars 111, 112 is in engagement with the leaf spring contacts e, f or either of the bus bars 111', 112 is in engagement with the leaf spring contact 2, f, no electrical contact is established between the brushes 122, 124. On the other hand, Whenever either of the surfaces a or c is in engagement with the leaf spring contacts e, f or either of the surfaces [7 or d is inengagement with the leaf spring contacts e, f, contact is established between the brushes 122, 124 by the segmental contact 156 of the rotary switch 123. Accordingly, as long as the cylinders 24 and 25 are rotated in a step-by-step manner in proper relationship to the rotation of the cam shaft 14,

they will not actuate the stop motion of the loom.

However, if a stepin rotation is not imparted to the cylinder 25 as it moves outwardly from the position shown in Figure 10, for example, with subsequent inward move ment of the cylinder 25, the bus bar 112 will again engage the contacts e', f so the portion of the segmental contact 150 identified by the arrow C will then be in registration with the brushes 122, 124 so the circuit is closed both at the cylinder 25 and at the rotary switch 123 thereby energizing the lamp or w-arning signal 116' at 7 the same time that the coil 62 of solenoid 61 is energized to thereby effect loom stoppage.

It will be noted that the warning signals or lamps 116, 116 are located conspicuously on the loom or adjacent the respective cylinders 24, 25, and are preferably suitably mounted on the horizontal framework 21 which supports the jacquard mechanism 20 (Figure 1). The lamps 116, 116 serve to indicate which cylinder is functioning improperly. It is apparent that, upon the cylinder as being improperly positioned relative to the cam shaft it, the bus bars 111 or 112 would establish contact between the contacts e, f at the same time that the segmental contact 150 on the rotary switch 123 would establish contact beween the brushes 122, 124, to also actuate the loom stop motion. There are various reasons why the cylinders 24, 25 may become out of time with the weaving instrumentalities. This is generally caused by failure of the hooks 40, 40 (Figure 7) to engage one of the corre sponding projections 37, 37 in the course of inactive strokes of the cylinders 24, 25.

It is thus seen that I have provided an improved, simple and effective means to automatically actuate the stop motion of a loom upon failure of either of the cylinders 24 or 25 to be properly positioned relative to the cloth forming instrumentalities of the loom or, upon the cards 26, 27 becoming improperly positioned relative to the cylinders or upon the cylinders themselves becoming improperly positioned relative to the banks of needles 30, 31.

In the drawings and specification there has been set forth a preferred embodiment of the invention and, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. In a loom having a jacquard mechanism provided with at least one electrically non-conductible and quadrangular cylinder, weaving instrumentalities, a series of pattern cards adapted to pass in engagement with said cylinder, and said loom being provided with at least one rotating shaft driven in timed relation to the weaving instrumentalities of the loom; the combination of a circuit adapted to be energized to stop the loom, means automatically operable upon rotation of said cylinder in improper relation to the operation of weaving instrumentalities of the loom for closing said circuit, means operable automatically for also closing said circuit upon said cards being improperly positioned relative to the jacquard mechanism, said first-named means comprising a first switch having a pair of spaced stationary contacts carried by said jacquard mechanism and disposed inwardly of the cylinder, opposite sides of said cylinder each having a bus bar thereon, said bus bars being disposed in circular relationship whereby, upon alternate active strokes of the cylinder, the corresponding bus bar will establish contact between the contacts and, upon intervening active strokes of the cylinder, the bare cylinder engages the contacts, a second switch in series with the first switch, said second switch comprising a rotor made from insulation material and driven by said shaft, a second pair of, spaced contacts interposed in said circuit and normally bearing against the periphery of said rotor, a segmental metallic member fixed on the periphery of said rotor and being of sufiicient width to bridge said second pair of contacts for establishing contact therebetween when in registration therewith, and said segmental member normally registering with the second contacts only during said intervening strokes of the cylinder, whereby upon said cylinder becoming out of time with the weaving instrumentalities, both switches will be closed simultaneously to energize the circuit.

2. In a loom having weaving instrumentalities and also having a jacquard mechanism provided with at least one series of pattern cards, a quadrangular and electrically non-conductible cylinder supporting said series of pattern cards, a bank of needles, means to reciprocate said cylinder inwardly and outwardly relative to the bank of needles, means to impart a quarter revolution to said cylinder in the course of each outward stroke thereof, and a circuit adapted to be energized for stopping the loom; the combination of first and second switches arranged in series and interposed in said circuit, said first switch comprising a pair of spaced stationary contacts carried by said jacquard mechanism and disposed inwardly of the cylinder, opposite sides of said cylinder each having a bus bar thereon, said bus bars being disposed in circular relationship whereby, upon alternate active strokes of the cylinder, the corresponding bus bar will establish contact between the contacts and, upon intervening active strokes of the cylinder, the bare cylinder engages the contacts, and means operable in timed relation to the weaving instrumentalities of the loom for closing the second switch during at least a part of each interim between successive alternate active strokes of said cylinder whereby, upon failure of said cylinder to be rotated a quarter revolution with an outward stroke thereof immediately subsequent to any of said alternate active strokes of the cylinder, the first and second switches will be closed simultaneously with the next of said intervening active strokes of the cylinder to energize said circuit and stop the loom.

3. A structure according to claim 2 wherein said loom is provided with at least one rotating shaft driven in timed relation to the weaving instrumentalities of the loom, said second switch comprising a rotor made from insulation material driven by said shaft, a second pair of spaced contacts interposed in said circuit and normally bearing against the periphery of said rotor, and a segmental metallic member on the periphery of said rotor and being of sufficient width to bridge said second pair of contacts for establishing contact therebetween when in registration therewith.

4. A structure according to claim 2 wherein said loom is provided with at least one rotating shaft driven in timed relation to the weaving instrumentalities of the loom, said second switch comprising a rotor, said rotor having a segmental metallic peripheral surface, and a second pair of spaced contacts interposed in said circuit and engageable by said metallic surface during a portion of each revolution of the rotor whereby said metallic surface establishes contact between the second pair of contacts when in registration therewith.

5. In a loom having weaving instrumentalities and also having a jacquard mechanism provided with at least one series of pattern cards, a cylinder supporting said series of pattern cards, a bank of needles, means to reciprocate said cylinder inwardly and outwardly relative to the bank of needles, means to impart a quarter revolution to said cylinder in the course of each outward stroke thereof, and a circuit adapted to be energized for stopping the loom; the combination of first and second switches arranged in series and interposed in said circuit, means for closing the first switch with alternate active strokes of the cylinder and maintaining the first switch open with intervening active strokes of the cylinder, means operable in timed relation to the weaving instrumentalities of the loom to normally close the second switch during at least a part of each interim between successive alternate active strokes of said cylinder comprising a rotor driven in timed relation to the weaving instrumentalities of the loom, said second switch including a pair of spaced contacts interposed in said circuit and engaging the periphery of said rotor, and a segmental metallic member on the periphery of said rotor and being of sufiicient width to bridge said pair of contacts for establishing contact therebetween when in registration therewith whereby, upon failure of the cylinder to be rotated a quarter revolution in the course of an outward stroke thereof immediately following any of said alternate active strokes of said cylinder, the first and second switches will be closed simultaneously to energize said circuit and stop the loom.

6. In a loom having weaving instrumentalities and also having a jacquard mechanism provided with at least one series of pattern cards, a quadrangular and electrically non-conductible cylinder supporting said series of pattern cards, a bank of needles, means to reciprocate said cylinder inwardly'and outwardly relative to the bank of needles, means to impart a quarter revolution to said cylinder in the course of each outward stroke thereof, and a circuit adapted to be energized for stopping the loom; the combination of first and second switches arranged in series and interposed in said circuit, said first switch comprising a pair of spaced stationary switch elements carried by said jacquard mechanism and disposed inwardly of the cylinder, switch-closing means on each of opposite sides of said cylinder for closing the circuit between said switch elements, said switch-closing means being disposed in circular relationship whereby, upon alternative active strokes of the cylinder, the corresponding switch-closing means will establish contact between the switch elements and, upon intervening active strokes of the cylinder, the circuit between the switch elements remains open, and means operable in timed relation to the weaving instrumentalities of the loom for closing the second switch during at least a part of each interim between successive alternate active strokes of said cylinder whereby, upon failure of said cylinder to be rotated a quarter revolution with an outward stroke thereof immediately subsequent to any of said alternate active strokes of the cylinder, the first and second switches will be closed simultaneously with the next of said intervening active strokes of the cylinder to energize said circuit and stop the loom.

References Cited in the file of this patent UNITED STATES PATENTS 1,336,677 Cannon Apr. 13, 1920 1,496,796 Walton June 10, 1924 20 2,361,145 McCaleb Oct. 24, 1944 

